Monthly Weather Bulletin
Generally the country is still in Northeast Monsoon period and is expected to end in March 2015. During January 2015, more rainfall was distributed over Sabah and Sarawak where some places in Sarawak were flooded. However, some areas in Peninsular Malaysia experienced hot and dry conditions especially over northern and southern parts. The surface temperatures, total solar radiations and rates of evaporation recorded were higher than average.
Climatologically, during this period, Peninsular Malaysia usually received less rain as compared to Sarawak and Sabah. Most areas in Peninsula experienced dry conditions with total monthly rainfall recorded were less than 100mm. Prai, Langkawi, Alor Setar, Chuping, Kota Bharu, Kuala Terengganu, Sitiawan, Kluang and Senai recorded less than 50% of average rainfall. The lowest rainfall amount of 5.4mm was recorded in Langkawi. In spite of the dry conditions, a few areas recorded above average rainfall. In particular, Ipoh, Cameron Highlands and Petaling Jaya received more than 40% of their January average. The total amount of rainfall recorded was between 200mm to 400mm.
Temporally, more rainfall was distributed during the first decade of the month. The highest number of rain days recorded was 27 days as recorded at Subang Meteorological Station while the lowest number of rain days was 2 days as recorded at Langkawi and Chuping Meteorological Station.
Over Sarawak, most areas experienced wet condition during January. Some areas received more than 40% of average rainfall particularly Kuching, Bintulu and Miri. The total rainfall amount recorded was between 400mm to 1000mm. Kuching had the highest rainfall amount of 1021.4 mm. The number of rain days recorded for Sarawak was between 26 to 28 days, whrere Kuching, Sri Aman and Kapit recorded the highest rain days during the month.
Sabah also experienced the same weather conditions. Most areas in Sabah had more than 60% of average rainfall with the total amount of rainfall between 300 mm and 700 mm. Kudat marks a new record for the highest rainfall in a day of 244.0mm on 13 January 2015 as compared to the last of 203.1mm (4 January 2003). Spatially, more rainfall was distributed over northern Sabah. The number of rain days recorded ranged between 15 days at Tawau to 27 days at Ranau.
Based on record, the mean temperatures for Peninsula were higher than average January temperature. The largest positive deviation was +0.8°C as recorded at Subang Meteorological Station while the largest negative deviation was -0.4°C as recorded at Gong Kedak Meteorological Station.
Monthly mean temperatures were below average for the state of Sabah and Sarawak during this January. The largest positive deviation was 0.6°C as recorded at Kota Kinabalu Meteorological Station while the largest negative deviation was -0.7°C as recorded at Bintulu Meteorological Station.
The highest temperature for the low land areas was 35.3°C as recorded at Prai Meteorological Station while the lowest temperature was 17.8°C as recorded at Kuala Pilah Meteorological Station. Cameron Highlands, the only high land station, had temperature ranged between 12.3°C and 23.8°C. The monthly mean temperature was 17.4°C.
Most of the meteorological stations recorded higher than average daily solar radiation during this month. The mean daily solar radiation for low land areas ranged between 11.68 MJm-2 and 21.05 MJm-2 as recorded at Kuching and Langkawi Meteorological Station respectively. The largest positive deviation was +2.54 MJm-² as recorded at Cameron Highlands and the largest negative deviation was -1.08 MJm-² as recorded at Kuching. The mean daily solar radiation for highland was 15.51 MJm-².
The mean daily rates of evaporation for January ranged between 2.0 mm/day and 5.8 mm/day as recorded at Langkawi and Sri Aman respectively. The largest positive deviation was +1.1 mm/day as recorded at Chuping Meteorological Station and the largest negative deviation was -0.9 mm/day as recorded at Kuching and Sri Aman Meteorological Stations. Cameron Highlands recorded 1.8mm/day of evaporation rates and deviated -0.1 mm/day from normal.
FIGURE 1 : Rainfall Map for Malaysia
FIGURE 2a : Mean Monthly Temperature
FIGURE 2b : Mean Monthly Maximum Temperature
FIGURE 2c : Mean Monthly Minimum Temperature
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